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本文用实例说明一种在振动环境中作全息试验的技术。这种技术的优点有:能对大结构就地检查它的小区域,能在结构整体作大幅度运动时检查它的局部区域的变形,能在象工厂车间这样的振动环境中作全息试验而不用隔振设备,能不用激光而只用白光来重现全息记录,以及只需要比常用实验室全息系统低得多的设备费用等。它的缺点有:由于底片尺寸有限而使视野受到限制,为了得到最佳结果而需要将物体涂以后向反射涂料层,以及不能作实时研究等。
This article illustrates an example of a holographic test in a vibratory environment. The advantages of this technique are: Small areas where large structures can be inspected in situ, and the deformation of localized areas of the structure as a whole can be checked for significant movements, allowing holographic testing in vibrational environments such as factory floors Without the use of vibration isolation equipment, it is possible to reproduce holographic recording with white light instead of laser light, as well as with much lower equipment costs than conventional laboratory holographic systems. Its drawbacks include limited field of view due to limited film size, the need to apply objects to retroreflective coatings for best results, and inability to do real-time research.